<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>向量练习</title>
</head>
<body>
  <p>画出点P到QR的垂线</p>
  <p>鼠标跳动任意一个点</p>
  <canvas width="500" height="500"></canvas>
</body>
<script src="./3-2.js" type="module"></script>
</html>